JohnKSa said:
Starting from the half-cock notch doesn't actually change the initial position of the DA trigger. What changes is the point at which the takeup stage of the trigger pull stops and the hammer starts moving.
The only 75B-based CZ I have at the moment is an 85 Combat, but as I understand it, the internal mechanism is the same as safety-equipped 75B, except for the firing pin block and linkage, and the hammer (which has the notch in question) is the same. I have shot, but never owned a decocker-equipped CZ.
When starting the trigger pull with my 85C from full hammer down, the trigger's rearward movement (take-up) is about 3/16th of an inch before you begin to engage the mechanism.
When you start from that gun's half-cock position, the trigger seems to start from about 3/16th of an inch farther back and there is much more easy movement allowed back before you start to engage the mechanism. That means you have more free-play AS you're positioning your finger. For some folks with safety-equipped CZs that may be more than enough.
Those reading here who have safety-equipped CZs should comment if their 75B is different than my 85 Combat. If not, it may be that the starting trigger position is different with decocker-equipped models.
If you based your comments upon handling a decocker-equipped CZ, that may explain why your comments differ from mine. (When examining my Sphinx SDP, which is similar to the CZ Decocker models (but not the same) the trigger seems to start from similar positions, but take up is quite different; when in the decocked position, takeup is greter and much lighter than when starting from hammer down.)
I also have a custom AT84s, which is a CZ-pattern gun based on the Tanfoglio design (but made in Switzerland). That gun, which is DA/SA and safety equipped has markedly different trigger starting positions when starting from hammer down or the half-cock notch. I don't know whether that is a Tanfoglio-based difference, or something the gunsmith did when doing his magic (before I bought the gun, used.) That is a marvelous semi-auto.